BS EN ISO 9000:2000 is a quality assurance model against which organisations can be certified. The ISO 9000 standard consists of three separate models, including ISO 9001, ISO 9002 and ISO 9003.

• ISO 9001 sets out the requirements for an organisation whose business processes range all the way from design and development, to production, installation and servicing;
• ISO 9002 is the appropriate standard for an organisation which does not carry out design and development, since it does not include the design control requirements of ISO 9001 – otherwise, its requirements are identical;
• ISO 9003 is the appropriate standard for an organisation whose business processes do not include design control, process control, purchasing or servicing, and which basically uses inspection and testing to ensure that final products and services meet specified requirements.